[Gate-users] How to simulate Lu-176 in LSO crystal

[Bryan McIntosh]

Hello Zhengzhi,

I wrote the second paper that you linked, and it looks like your initial
idea was in the right direction; I made a Lu-176 source that encompassed
the entire detector. The difference is that I used the "confine" command
for the source, not "attach;" the complete code was as follows:

#Single intrinsic source; confined to crystal
/gate/source/addSource intrinsic
/gate/source/intrinsic/gps/particle ion
/gate/source/intrinsic/gps/ion 71 176 0 0
/gate/source/intrinsic/gps/monoenergy 0. keV #Super important!
/gate/source/intrinsic/gps/angtype iso
/gate/source/intrinsic/gps/type Volume
/gate/source/intrinsic/gps/shape Cylinder
/gate/source/intrinsic/gps/radius 14.5 cm
/gate/source/intrinsic/gps/halfz 70.1 mm
/gate/source/intrinsic/setActivity 20192.56 Bq
/gate/source/intrinsic/gps/confine crystal_P

This worked for a system where the crystal volume was named called
"crystal," and was duplicated using a cubic array. Be advised that the
activity and dimensions of the source were set up to match the Siemens
Inveon dPET system; adjust the size and activity accordingly for your
particular system. I used an activity of 276 Bq/cm^3 of LSO crystal,
calculated from a 2.6% concentration of Lu-176 in the Lu atoms making up
the crystal. This is different than the 250 Bq/cm^3 that is often used,
since that number was from a measurement that was 250 counts per
second/cm^3, not necessarily Bq.

This code worked when I ran it back in 2011; I haven't tested it on a GATE
version newer than 6.2. I THINK it will work with newer versions of GATE,
but your results may vary!

Good luck!

-Bryan McIntosh

On Thu, Jun 11, 2020 at 1:37 PM <
gate-users-request at lists.opengatecollaboration.org> wrote:

> ------------------------------
>
> Message: 2
> Date: Wed, 10 Jun 2020 22:09:13 -0700
> From: Albert Grace Lieu <albertnew2018 at gmail.com>
> To: gate-users <gate-users at lists.opengatecollaboration.org>
> Cc: Peter Olcott <polcott at reflexion.com>
> Subject: [Gate-users] How to simulate Lu-176 in LSO crystal
> Message-ID:
>         <CAGLxnT-Qdh-NZ8KoBOQuH=
> zszHP+zw5f_aeD5ADLNDP9zYzG6Q at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> Dear Gate users and developers,
>
> There are a couple of papers [1
> <https://aapm.onlinelibrary.wiley.com/doi/abs/10.1118/1.4824694>,2
> <https://ieeexplore.ieee.org/document/5751205>] addressing the importance
> of adding the simulation of Lu-176 in Lutetium based crystal in GATE
> simulation. I try to do this to my simulated PET system that has thousands
> of pieces of crystals (created with linear and cubic array repeater). My
> general idea of implementing this is to create a Lu176 ion source and then
> attach it to my crystals. However,  when I do:
>
> /gate/source/Lu176/attachTo Crystal
>
> the Lu176 is only attached to a single piece of crystal (which can be
> visualized with /gate/source/Lu176/visualize 1000 red 3).  Has anyone
> implemented this before? Could you please share your thoughts?
>
> Thanks a lot. Greatly appreciated.
>
> Zhengzhi
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